Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: fix RCU list diversion in ip6_mc_del1_src() When removing a source filter whose count reaches zero, ip6_mc_del1_src() unlinks psf from pmc->mca_sources. If the filter was previously active, the code moved psf directly into pmc->mca_tomb by updating psf->sf_next. Because pmc->mca_sources is traversed locklessly under RCU (e.g. by ipv6_chk_mcast_addr()), mutating psf->sf_next before a grace period elapses diverts concurrent readers to the tombstone list. Consequently, readers miss remaining active sources in pmc->mca_sources and improperly examine deleted tombstone entries. Fix this by allocating a new tombstone node for pmc->mca_tomb (as done in sf_setstate()) and retiring the original psf via kfree_rcu().
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 4b200e398953c237c86d32bf26d4cb2a96556a6f before c3343cd7ec8706c221e52b782f386b9af14a928a; affected 4b200e398953c237c86d32bf26d4cb2a96556a6f before 4352737297b262e8367675c19a7dc6a9f53c97af; affected 4b200e398953c237c86d32bf26d4cb2a96556a6f before 8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4; affected 4b200e398953c237c86d32bf26d4cb2a96556a6f before 5149c60c406595b56fda0c6e9aae7fd287f636aa; affected 4b200e398953c237c86d32bf26d4cb2a96556a6f before 93b49239840b91313adbd77b8b52993eff2d08c1; affected 86c49119f0353f857cc08030ec9e4ebaab3d5a64; affected 5.10.261 before 5.11 |
| Linux / Linux | affected 5.13; unaffected 0 before 5.13; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2.7 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/c3343cd7ec8706c221e52b782f386b9af14a928a
- https://git.kernel.org/stable/c/4352737297b262e8367675c19a7dc6a9f53c97af
- https://git.kernel.org/stable/c/8d4fe5c13f5056faa6deb09a90e24a89f9ebfad4
- https://git.kernel.org/stable/c/5149c60c406595b56fda0c6e9aae7fd287f636aa
- https://git.kernel.org/stable/c/93b49239840b91313adbd77b8b52993eff2d08c1